/**
 * Check if an element has a class
 * @param {HTMLElement} elm
 * @param {string} cls
 * @returns {boolean}
 */
export function hasClass(ele: HTMLElement, cls: string) {
    return !!ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
  }
  
  /**
   * Add class to element
   * @param {HTMLElement} elm
   * @param {string} cls
   */
  export function addClass(ele: HTMLElement, cls: string) {
    if (!hasClass(ele, cls)) ele.className += ' ' + cls;
  }
  
  /**
   * Remove class from element
   * @param {HTMLElement} elm
   * @param {string} cls
   */
  export function removeClass(ele: HTMLElement, cls: string) {
    if (hasClass(ele, cls)) {
      const reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
      ele.className = ele.className.replace(reg, ' ');
    }
  }
  
  export function mix(color1: string, color2: string, weight: number) {
    weight = Math.max(Math.min(Number(weight), 1), 0);
    const r1 = parseInt(color1.substring(1, 3), 16);
    const g1 = parseInt(color1.substring(3, 5), 16);
    const b1 = parseInt(color1.substring(5, 7), 16);
    const r2 = parseInt(color2.substring(1, 3), 16);
    const g2 = parseInt(color2.substring(3, 5), 16);
    const b2 = parseInt(color2.substring(5, 7), 16);
    const r = Math.round(r1 * (1 - weight) + r2 * weight);
    const g = Math.round(g1 * (1 - weight) + g2 * weight);
    const b = Math.round(b1 * (1 - weight) + b2 * weight);
    const rStr = ('0' + (r || 0).toString(16)).slice(-2);
    const gStr = ('0' + (g || 0).toString(16)).slice(-2);
    const bStr = ('0' + (b || 0).toString(16)).slice(-2);
    return '#' + rStr + gStr + bStr;
  }
  // 大驼峰法
  export function upperCamelCase(str:string) {
    return str.replace(/(^.)|\_([a-zA-Z])/g, function(a, x1, y1) {
      return (x1 || y1).toLocaleUpperCase()
    })
  }